Burglar-alarm



(No Model.)

0. H. DOWDEN.

v BURGLAR ALARM. v No. 852,861. Patented Nov. 1-6, 1886.

x"- T we 75y e. WITNESSES .INVHNTOR Wfifizfi flaw 1 BY W ATTORNEYS.

CHARLES H. DOIVDEN, OF

BURGLAR PATENT @rrics.

NEVVAIi-K, NEIV JERSEY.

-ALARlVl.

SBPESIPILATEON forming part of Letters Patent. No. 352,861, dated November 16, 1886.

Application filed March 11, 1886. Serial No. 194,915 (No model.)

To all whom it may concern Be it known that I, CHARLES H. DOWDEN, of the city of Newark, in the county of Essex and State of New Jersey, have invented a new and Improved Burglar-Alarm, of which the following is a full, clear, and exact description.

The object of my invention is to pro ide a new and improved lmiglar-alarin, which gives an immediate alarm when either the lower window-sash is raised or the upper windowsash is lowered, and which continues to sound the alarm as long as thesashes are in such raised or lowered position, which makes it impossible for the windows to give a false alarm, as theymustbe raised or lowered about an inch before an alarm can possibly be given.

The invention consists of two sliding metallic buttons, each. placed in a metallic shell at tached to the window-jamb, ot a metallic strip or bar secured to one edge of each windowsash, and of two wires, each attached to a metallic shell, and connected, respectivelywith a battery and a device for giving the alarm.

The invention also consists of various parts and details, and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part 01' this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a longitudinal sectional elevation on thelinex 0c, Fig.2, ot'the lower sash, showing my improvement. Fig. 2 is ascctional plan view of the same on the line y y, Fig. 1. Fig. 3 is a face view of the window-Jami), partly in section, showing the buttons and shells and their respective connections.

To either outer edge of the lower windowsash, A, is fastened a metal strip, B, which we tends from a short distance below the topv of the sash to the bottom of the same, and to one edge of the upper sash, A, is attached a similar strip, B.

In each race of the window-j amb O are formed two apertures, D and D, in the same horizontal plane and a short distance apart. In each of these recesses or apertures is fitted a metal shell, E or E, in which slides a metallic button, F or F, which is closed and roundedoit' at its outer end only.

In each shell E or E is placed a pin, II, having a head, 11, which rests against the jamb O at the inner end of the recess 1) or D. Around the pin II is coiled a spring, I, one end of which rests against the head II, and the other end presses against the closed outer end of the metallic button F or F, so as to hold said button in constant contact with the outer edge of the sash A or A.

To each of the shells-E and E is attached a wire, J or J, which passes through the jamb O and along its inner side, either up or down, according to circumstances. Que wire J or J-connects with the battery K and the other.

their respective metal strips B and B are a short distance from the closed ends of the buttons F and F, which then rest against the woodwork of the sash; but when either the lower sash, A, is raised, or the upper sash, A, is lowered, the respective metal plate B or B comes in contact with the two metallic buttons F and F, thus making a metallic connection between the two buttons F and F, whereby an electric circuit is completed betwen the battery K and the alarm L, which latter thus gives the alarm until the sashisagain closed. The spring I keeps the outer closed end of the button F or F in constant contact with the outer edge of the window-sash, and also compcnsates for all play between the sash and the jamb caused by wear or shrinkage.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patcn.t

1. In a burglaralarm, a metallic strip attached to the outer edge ofa windowsash, in combination with two metallic buttons, each sliding in a shell and pressed against the outer edge of the sash by a spring,-and wires connecting the said buttons with an alarm and a battery, substantially as shown and described.

2. In a burglaralarm, a metallic strip attached to the outer edge of a windowsash, in combination with two metallic buttons placed in the jamb of the window-frame and pressed against the outer edge of the window-sash by tery, substantially as herein shown and desprings, so that when the sash is raised or scribed. lowered a contact is established between the 4. In a burglar-alarm, the shells E and E, 1 metallic strip and the metallic buttons, and the sliding buttons F and F, the pins H, havl 5 when the sash is closed the said metallic strip ing heads H, the springs I, and a metallic 2o and buttons are out of contact, substantially as plate, B, attached to the outer edge of the shown and described. window-sash, in combination with the wires J 3. In a burglar-alarm, the window-sash A, and J, connecting with the alarm and with provided with the metallic strip B, in combithe battery, substantially as herein shown and I0 nation with the shells E and E, placed in the described. jamb G, the sliding metallic buttons Fand F, pressed against the edge of the window-sash by the springs I, held in place by pins H, hav- Witnesses: ing heads H, and the wires J and J, conneet- THEO. G. HOSTER, r 5 ing the shells E and E with an alarm anda hat 0. SEDGWICK.

CHARLES H. DOWDEN. 

